The Colorado governor told officials to give proper attention to regulating both impaired driving as well as edible cannabis products, two aspects Hickenlooper believes his state struggled with since passing their own legal marijuana initiative in 2012.

“We made an awful lot of mistakes as we were trying to wrestle with some of these issues,” Hickenlooper told the California legislators.

Proposition 64 did not set a standard for impaired driving, although studies suggest that setting a resolute impairment limit doesn’t make sense when it comes to measuring marijuana intoxication. Gov. Hickenlooper, however, believes that a testing standard of 5 nanograms of THC per milliliter of blood should be set.

“We think 5 nanograms is the right number,” he said. “We went through a lot of testing.”

Hickenlooper also advised officials to adopt labeling and marketing rules for retail cannabis products, and edibles in particular, in order to insure proper dosage and avoid packaging that can appeal to children.

California lawmakers also asked Hickenlooper about how the Trump administration will handle legal pot in states that allow it. He said that while there has been some federal enforcement against illegal marijuana activity, he believes Trump will ultimately respect the decision of individual states that have passed some sort of legal cannabis law.

“We’re optimistic that he is going to let the experiment continue,” Hickenlooper said.

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